code: def _parallel_changed(self, change):
      parallel_files = [
          "ipcontroller_config.py",
          "ipengine_config.py",
          "ipcluster_config.py",
      ]
      if change["new"]:
          for cf in parallel_files:
              self.config_files.append(cf)
      else:
          for cf in parallel_files:
              if cf in self.config_files:
                  self.config_files.remove(cf)
  
imports: import os
  from traitlets.config.application import Application
  from IPython.core.application import BaseIPythonApplication, base_flags
  from IPython.core.profiledir import ProfileDir
  from IPython.utils.importstring import import_item
  from IPython.paths import get_ipython_dir, get_ipython_package_dir
  from traitlets import Unicode, Bool, Dict, observe
label_desc: Use image node_id 3 for calling the ProfileCreate obj's underlying member method code with example usage: obj._parallel_changed(change) without return types